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Fair Value Measurement (Detail Textuals) - shares	1 Months Ended	12 Months Ended
	Sep. 29, 2018	Dec. 31, 2018	Dec. 31, 2017
Pre-IPO Series C-2 convertible redeemable preferred shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Issuance of preferred shares	483,702	483,702	0

X

- Definition

Temporary equity stock issued during period.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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